폴리에스터카보네이트의 합성과 열적 성질

이상수; 민성식; 안태완; 조재영

Polymer(Korea), Vol.21, No.2, 208-214, March, 1997

Export Citation

폴리에스터카보네이트의 합성과 열적 성질

Synthesis and Thermal Properties of Polyestercarbonates

이상수, 민성식, 안태완, 조재영

초록

폴리카보네이트(PC)의 내열성 및 열안정성을 향상시킬 목적으로 PC의 구조에 폴리아릴레이트(PAr)의 구조단위인 방향족 에스터기를 도입하여 폴리에스터카보네이트(PEC)를 카보네이트 함량에 따라 6 종류 합성하였다. 조성의 조절을 위하여 triphosgene을 두 번에 걸쳐 주입하는 저온 용액중합 방법을 사용하였다. 합성된 고분자량 PEC들의 구조와 조성을 NMR과 IR로 확인하였다. PEC의 유리전이온도는 두 성분 고분자의 혼합률로 예상한 것보다 높은 것으로 측정되었으며, 특히 작은 카보네이트 함량에서 PAr보다 높은 유리전이온도를 나타내었다. 이는 공중합에 의한 집적밀도의 증가에 의한 것으로 해석되었다. PEC의 열안정성은 아릴레이트 함량에 따라 증가하였으며, 열분해는 카보네이트 구조로부터 시작하는 것으로 판단되었다.

On purpose to enhance the heat resistance of polycarbonate(PC), aromatic esters, which are the structural units of polyarylate(PAr), were incorporated. Six polyestercarbonates(PEC) over a full composition range were prepared through two-step low-temperature solution polycondensation reactions with controlled feeding of triphosgene. PEC prepared were characterized to be random copolymers with high molecular weights. The glass transition temperatures of PEC showed positive deviations from the rule of mixture. For PEC with low carbonate contents the glass transition temperatures were even higher than that of PAr, which was thought to be due to higher chain packing density of the copolymers. Thermal stability of PEC appeared to be enhanced from PC with increasing content of arylate units, while thermal degradation started at carbonate units.

Keywords:polyestercarbonate;synthesis;thermal properties;thermal stability

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[2] Hechelhammer W, Delistocker G, Kunstoffe, 49, 3 (1959)

[3] Morbitzer L, Grigo U, Angew. Makromol. Chem., 162, 87 (1988)

[4] Freitag D, Westeppe U, Makromol. Chem. Rapid Commun., 12, 95 (1991)

[5] Mondragon I, J. Appl. Polym. Sci., 32, 6191 (1986)

[6] Goldberg EP, Strause SF, Munro HE, Polym. Prepr., 5, 233 (1964)

[7] Prevorsek DC, Debona BT, Kestern Y, J. Polym. Sci. A: Polym. Chem., 18, 75 (1980)

[8] Baker JT, Cooke RS, Sifniades S, U.S. Patent, 4,194,038 (1980)

[9] Baker JT, Cooke RS, Sifniades S, U.S. Patent, 4,219,635 (1980)

[10] Markezich RL, Quinn CB, U.S. Patent, 4,238,597 (1980)

[11] Swart DJ, Kleyman JS, U.S. Patent, 4,278,787 (1981)

[12] Bales SE, U.S. Patent, 4,330,662 (1982)

[13] Bales SE, U.S. Patent, 4,388,455 (1983)

[14] Miller KF, Hilakos W, U.S. Patent, 4,465,820 (1984)

[15] Eckert H, Forster B, Angew. Chem.-Int. Edit., 26, 894 (1987)

[16] Daly WH, Poche D, Tetrahedron Lett., 29, 5859 (1988)

[17] Scriven EF, Chem. Soc. Rev., 12, 129 (1983)

[18] Kwei T, J. Polym. Sci. C: Polym. Lett., 22, 307 (1984)

[19] Mondragon I, Nazabal J, J. Appl. Polym. Sci., 32, 6191 (1986)

[20] Bosnyak CP, Parsons IW, Hay JN, Haward RN, Polymer, 21, 1448 (1980)

[21] Bosnyak CP, Parsons IW, Hay JN, Haward RN, Polymer, 23, 609 (1982)

[22] Bicerano J, Clark HA, Macromolecules, 21, 585 (1988)

[23] Bicerano J, Clark HA, Macromolecules, 21, 597 (1988)